US 11,866,356 B2
Method and system for controlling hydrophobic conditions and fouling in water intensive processes
Mehrdad Hesampour, Espoo (FI); Roderick Abinet, Bad Soden (DE); Marjatta Piironen, Oulu (FI); Eija Korte, Espoo (FI); and Iiris Joensuu, Espoo (FI)
Assigned to KEMIRA OYJ, Helsinki (FI)
Appl. No. 16/339,920
Filed by KEMIRA OYJ, Helsinki (FI)
PCT Filed Oct. 6, 2017, PCT No. PCT/FI2017/050708
§ 371(c)(1), (2) Date Apr. 5, 2019,
PCT Pub. No. WO2018/065674, PCT Pub. Date Apr. 12, 2018.
Claims priority of application No. 20165758 (FI), filed on Oct. 7, 2016.
Prior Publication US 2020/0048126 A1, Feb. 13, 2020
Int. Cl. B01D 65/02 (2006.01); B01D 65/08 (2006.01); C02F 1/24 (2023.01); C02F 1/52 (2023.01); C02F 1/28 (2023.01); C02F 1/44 (2023.01); C02F 9/00 (2023.01); C02F 103/10 (2006.01); C02F 103/28 (2006.01); C02F 103/32 (2006.01); C02F 103/36 (2006.01); C02F 103/02 (2006.01)
CPC C02F 9/00 (2013.01) [B01D 65/02 (2013.01); B01D 65/08 (2013.01); C02F 1/24 (2013.01); C02F 1/281 (2013.01); C02F 1/44 (2013.01); C02F 1/5209 (2013.01); C02F 2103/02 (2013.01); C02F 2103/10 (2013.01); C02F 2103/32 (2013.01); C02F 2103/365 (2013.01); C02F 2209/001 (2013.01); C02F 2209/003 (2013.01); C02F 2209/11 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method of controlling a water treatment process, the method comprising:
adding at least one pretreatment chemical to a water stream in a pretreatment process including a coagulation step and/or a flocculation step and at least one separation step to reduce amount of dissolved and/or particulate matter in the water stream, wherein said at least one separation step contains a flotation step or a sedimentation step,
monitoring, in an online monitoring unit, hydrophobic conditions in the water stream upstream and/or downstream from said adding the at least one pretreatment chemical, wherein monitored and targeted hydrophobic conditions in the water stream are determined by determining hydrophobicity based on a fluorescence measurement, and by determining the amount or count of particles based on a light scattering measurement,
wherein dosing of said at least one pretreatment chemical to the water stream is based on the monitored hydrophobic conditions such that the hydrophobic conditions in the pretreated water are brought towards target hydrophobic conditions,
wherein a process controller of the pretreatment process is connected to a membrane cleaning system of a membrane filtration stage following the pretreatment process, and wherein the membrane cleaning system is controlled based on the monitored hydrophobic conditions.